TABLE 1.
FT-IR band assignments of E. coli
| Wave no. (cm−1) | Functional group assignment |
|---|---|
| ∼3,200 | N-H stretching of amide A in proteins |
| 2,955–2,850 | C-H asymmetric stretching of -CH2 and -CH3 in fatty acids |
| ∼1,637 | Amide I of beta-pleated sheet structures of proteins |
| 1,550–1,520 | Amide II band of proteins |
| 1,468 | C-H deformation of CH2 in lipids |
| 1,415 | C-O-H in plane bending in carbohydrates, DNA/RNA backbone, proteins |
| ∼1,400 | C=O symmetric stretching of COO− group in amino acids, fatty acids |
| ∼1,355 | Wagging vibrations of methylene fragments |
| 1,310–1,240 | Amide band III components of proteins |
| 1,250–1,225 | P=O stretching asymmetric of PO2− phosphodiesters in phospholipids |
| 1,084 | Stretching P=O of phosphodiester, phosphorylated proteins, or polyphosphate products |
| 900–600 | Fingerprint region |